Chronology of some key events in U.S. relations with Islamic groups and with Usama bin Laden before Sept. 11, 2001:
Feb. 26, 1993 -- Bomb explodes in garage under World Trade Center, killing six and injuring more than 1,000. Group of Islamic extremists later convicted.
Nov. 13, 1995 -- Seven people, including five Americans, killed when two bombs explode at U.S.-Saudi military facility in Riyadh, Saudi Arabia. Usama bin Laden blamed for attack.
Sept. 27, 1996 -- Taliban, suspected of giving refuge to bin Laden, completes takeover of Kabul, Afghanistan.
June 25, 1996 -- Bin Laden followers detonate bomb at U.S. military base near Dhahran, Saudi Arabia, killing 19 American soldiers and wounding hundreds of Americans and Saudi Arabians.
Aug. 7, 1998 -- U.S. embassies in Nairobi, Kenya, and Dar es Salaam, Tanzania, bombed, killing more than 250 people, including 12 Americans, and injuring 5,000. In retaliation, United States launches airstrikes against suspected terrorist camps in Sudan and Afghanistan.
Aug. 28, 1998 -- FBI accuses bin Laden of having declared "jihad," or holy war, against United States. Complaint also alleges bin Laden founded Al Qaeda that year to promote Islamic fundamentalism and force non-Muslims out of Muslim countries.
November 4, 1998 -- Bin Laden charged with ordering embassy bombings.
Oct. 12, 2000 -- Suicide bombers in Yemen attack U.S. Navy destroyer USS Cole, killing 17 sailors. Officials suspect bin Laden involvement.
Jan. 15, 2001 -- U.N. imposes new economic sanctions against Taliban for refusing to turn over bin Laden for trial.